Gregmat day 1 week 3 class question

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Can someone give a more clarified explaination?
I can just put anything as r (range 1-179) and s would the leftover of 180.

Yes. So the answer would be D. S can also equal 60 if r is 120 and s is not 60 when r is anything other than 120

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isnt there any limitation for r?

Nope. No limitation

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